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  4. The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is

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Q. The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is _______

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Solution:

$\overset{+7}{Mn}O _4^{-}+4 H ^{+}+3 e ^{-} \rightarrow \overset{+4}{ Mn}O _2+2 H _2 O$